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Failed to resolve given hostname/IP: plugins. Note that you can't use '/mask' and '1-4,7,100-' style ip ranges
Failed to resolve given hostname/IP: README. Note that you can't use '/mask' and '1-4,7,100-' style ip ranges
Failed to resolve given hostname/IP: scripts. Note that you can't use '/mask' and '1-4,7,100-' style ip ranges
Failed to resolve given hostname/IP: test. Note that you can't use '/mask' and '1-4,7,100-' style ip ranges

Failed to resolve given hostname/IP: plugins. Note that you can't use '/mask' and '1-4,7,100-' style ip ranges
Failed to resolve given hostname/IP: README. Note that you can't use '/mask' and '1-4,7,100-' style ip ranges
Failed to resolve given hostname/IP: scripts. Note that you can't use '/mask' and '1-4,7,100-' style ip ranges
Failed to resolve given hostname/IP: test. Note that you can't use '/mask' and '1-4,7,100-' style ip ranges

etc etc etc.......
Im new so take pity on me

Thanks

Not sure if the * is valid but from the error nmap seems to think you are trying to use it as a wildcard and IP ranges are not allowed also not sure what -PN option is supposed to do but try without it and add -v or -vv for verbose output may help to diagnose it